<template>
    <div>
        <!-- 面包屑导航 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 提示 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" class="el-icon-warning" :closable="false"></el-alert>
            <!-- 选择商品分类 -->
            <el-row :gutter="10" class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 级联选择框 -->
                    <el-cascader
                        :options="catalist"
                        :props="cateProps"
                        v-model="selectedCateKeys"
                        @change="handleChange"
                        clearable
                        >
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tabs页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数列表区域 -->
                    <el-table :data="manyTableData" style="width: 100%" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag :key="i" v-for="(item, i) in scope.row.attr_vals" closable @close="handleClose(i, scope.row)">
                                  {{item}}
                                </el-tag>
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="序号"></el-table-column>
                        <el-table-column prop="attr_name" label="参数名称"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <!-- 修改按钮 -->
						        <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
						        <!-- 删除按钮 -->
						        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态属性列表区域 -->
                    <el-table :data="onlyTableData" style="width: 100%" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag :key="i" v-for="(item, i) in scope.row.attr_vals" closable @close="handleClose(i, scope.row)">
                                  {{item}}
                                </el-tag>
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="序号"></el-table-column>
                        <el-table-column prop="attr_name" label="属性名称"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <!-- 修改按钮 -->
						        <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
						        <!-- 删除按钮 -->
						        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数对话框 -->
        <el-dialog :title="'添加' + titleTypes" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleTypes + '：'" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <div slot="footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </div>
        </el-dialog>

        <!-- 修改参数对话框 -->
        <el-dialog :title="'修改' + titleTypes" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleTypes + '：'" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <div slot="footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </div>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            // 商品分类列表
            catalist:[],
            // 级联选择框的配置对象
            cateProps:{
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 级联选择框双向绑定到的数据
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName: 'many',
            // 参数列表
            // 动态参数数据
            manyTableData:[],
            // 静态属性数据
            onlyTableData:[],
            
            // 控制添加对话框的现隐
            addDialogVisible: false,
            // 添加参数的表单数据
            addForm:{
                attr_name: ''
            },
            // 添加参数的表单验证规则
			addFormRules: {
				// 验证参数名称
				attr_name: [{ required: true, message: '请输入正确的参数名称！', trigger: 'blur' }, { min: 2, message: '请输入至少两个字符！', trigger: 'blur' }],
			},

            // 控制修改参数对话框的现隐
            editDialogVisible: false,
            // 修改的表单数据对象
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                // 验证参数名称
				attr_name: [{ required: true, message: '请输入正确的参数名称！', trigger: 'blur' }, { min: 2, message: '请输入至少两个字符！', trigger: 'blur' }],
            },
            // 控制按钮与文本框的切换显示
            inputVisible: false,
            // 文本框输入的内容
            inputValue: ''
        }
    },
    created(){
        this.getCateList();
    },
    methods:{
        // 获取所有的商品分类
        async getCateList(){
            const { data:res } = await this.$http.get('categories');
            if(res.meta.status !== 200){
                return this.$message.error({
                    showClose: true,
                    message: '获取商品分类失败！'
                })
            }
            this.catalist = res.data;
        },
        // 级联选择框 选中项变化会触发的事件
        handleChange(){
            this.getParamsData();
        },
        // tabs页签点击事件的处理
        handleTabClick(){
            this.getParamsData();
        },
        // 获取参数的列表数据
        async getParamsData(){
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length != 3){
                this.selectedCateKeys = [];
                this.manyTableData = [];
                this.onlyTableData = [];
                return;
            }
            // 否则就证明选中的是三级分类
            // 根据所选的分类id和当前所处的tabs，获取对应的数据
            const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{sel: this.activeName}
            });
            if(res.meta.status !== 200){
                this.$message.error({
                    showClose: true,
                    message: '获取参数列表失败！'
                })
            }

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                // 控制文本框的显示与隐藏
                item.inputVisible = false;
                // 文本框输入的值
                item.inputValue = ''
            });

            if(this.activeName === "many"){
                this.manyTableData = res.data;
            }else{
                this.onlyTableData = res.data;
            }
            
        },
        // 监听对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields();
        },
        // 添加参数事件
        addParams(){
            this.$refs.addFormRef.validate( async valid =>{
                if(!valid) return
                // 发起添加参数的请求
                const { data:res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201){
                    return this.$message.error({
                        showClose: true,
                        message: '添加参数失败！'
                    })
                }
                this.$message.success({
                    showClose: true,
                    message: '添加参数成功！'
                })
                this.addDialogVisible = false;
                this.getParamsData();
            })
        },
        // 点击按钮 展示修改对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
                params: { attr_sel: this.activeName }
            });
            console.log(res);
            if(res.meta.status !== 200){
                return this.$message.error({
                    showClose: true,
                    message: '获取参数信息失败！'
                })
            }
            this.editForm = res.data;
            this.editDialogVisible = true;
        },
        // 重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields();
        },
        // 点击按钮修改参数
        editParams(){
            this.$refs.editFormRef.validate( async valid => {
                if(!valid) return;
                // 发起修改请求
                const { data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 200){
                    this.$message.error({
                        showClose: true,
                        message: '修改参数失败！'
                    })
                }
                this.$message.success({
                    showClose: true,
                    message: '修改参数成功！'
                })
                this.getParamsData();
                this.editDialogVisible = false;
            })
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
				cancelButtonText: '取消',
				type: 'warning'
            }).catch(err => err);
            if (confirmResult !== 'confirm') {
				return this.$message.info({
					showClose: true,
					message: '已取消删除！'
				});
			}
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
            if (res.meta.status !== 200) {
				return this.$message.error({
					showClose: true,
					message: '删除参数失败！'
				});
			}
            this.$message.success({
				showClose: true,
				message: '删除参数成功！'
			});
            this.getParamsData();
        },
        // 文本框失去焦点或按下enter键 触发该事件
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = '';
                row.inputVisible = false;
                return
            }
            // 如果没有return 证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = '';
            row.inputVisible = false;
            // 需要发起请求。保存操作
            this.saveAttrVals(row);
        },
        // 将 attr_vals的操作，保存到数据库
        async saveAttrVals(row){
            // 需要发起请求。保存操作
            const { data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name, 
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error({
                    showClose: true,
                    message: '修改参数项失败！'
                })
            }
            this.$message.success({
                showClose: true,
                message: '修改参数项成功！'
            })
        },
        // 点击按钮 展示文本输入框
        showInput(row){
            row.inputVisible = true;
            // .$nextTick方法的作用：当页面上元素被重新渲染后才会，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            })
        },
        // 点击删除对应的参数可选项
        handleClose(i, row){
            row.attr_vals.splice(i, 1);
            this.saveAttrVals(row);
        }
    },
    computed:{
        // 如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length != 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类id
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2];
            }
            return null;
        },
        // 动态计算标题的文本
        titleTypes(){
            if(this.activeName === "many"){
                return "动态参数"
            }
            return "静态属性"
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-cascader{
    width: 30%;
}
.el-tag{
    margin: 5px;
}
.input-new-tag{
    margin: 5px;
    width: 120px;
}
</style>